Manifold lock



Dec. 11, 1923.

M. P. H. SCHROEDER MANIFOLD LOCK Filed June 13.

1921 2 Sheets-Sheet 1 II. a a a l 7. 4 4 e l a 9 1 U m 7 Z a 0 a Dec. 11, 1923. 1,476,924

M. P. H. SCHROEDER MANIFOLD LOCK Filed June 13. 1921 2 Sheets-Sheet 2 A! [0 mg 2 4: 7 i a 41 II x 16 Z4 Rg/IIIIIIIIIII/III/II/Il Patented Dec. 11, 1923.

UNITED STATES MARTIN P. H. SCI-TROEDER, OF CHICAGO, ILLINOIS.

MANIFOLD LOCK.

Application filed June 13, 1921. Serial No. 476,982.

T 0 all whom it may concern:

Be it known that I, MARTIN 1-". H. SoHRoEnnn, a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in a Manifold Lock; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the numerals of reference marked thereon, which form a part of this specification.

This invention relates more particularly to an improved type of a. manifold lock adapted to be mounted in the intake manifold of an internal combustion engine to afford a means whereby the supply of a combustible medium from a carburetor is adapted to be shut off by a key operated valve memher which is adapted to be locked in both closed and open positions.

It is an object of this invention to provide a lock for the intake manifold of an internal combustion engine to prevent theft of vehicles.

It is afurther object of this invention to provide an engine intake manifold with a valve adapted to be operated by means of a key controlled lock whereby the valve may be positioned transversely across the manifold against ribs formed in the manifold for the purpose of obviating leakage past the valv It is furthermore an object of the invention to. provide an engine intake manifold with a control valve adapted to be released when in open position to permit the same to automatically move into a closed position to stop the flow of gases through the intake manifold.

Still another object of the invention is the construction of manifold lock having 4-. valve member which is adapted to be reeased from the dash board of a vehicle to permit the valve member to automatically move into a closed position from which it can be released only by the operation of'a key controlled lock to which the valve member is connected. 7

A further object of the invention is to provide a manifold lock wherein a means is provided to limit the movement of a valve,

member forming apart of the lock.

It is an important object of this inven tion to provide an intake manifold lock of within the lock.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompanying drawings.

The invention -(in preferred forms) is shown on the drawings and hereinafter more fully described.

On the drawings:

Figure 1 is a side elevation of an automobile engine the intake manifold of which is equipped with a lock embracing the principles of this invention.

Figure 2 is an enlarged detail section taken on line 2-2 of Figure 1 showing the lock and valve in elevation.

Figure 3 is an enlarged detail section taken on line 33 of Figure 1, showing the valve in elevation in closed position with a key in place to permit opening of the valve.

Figure l is a fragmentary detail section taken on line 4-4 of Figure 3 with the valve in elevation. r

Figure 5 is a transverse section taken on line 55 of Figure 3 with the key holding the lock tumblers in release position.

Figure 6 is a similar section'with the. key removed showing the lock tumblers in looking positionto prevent turning of the lock barrel.

Figure 7 is a detail section taken on line 77 of Figure 3.

Figure 8 is a fragmentary view. of an automobile dash board and intake manifold equipped with a modified form of lock device.

Figure 9 is an enlarged detail section taken on line 9-9 of Figure 8 showing the lock and valve in elevation with parts broken away to disclose a modified form of a device for holding the valve in open position against accidental closing.

Figure 10 is a section taken on line 10-10 of Figure 9.

Figure 11 is a detail section taken on line 11-.11 of Figure 9.

As shown on the drawings:

The reference numeral 1 indicates an automobile internal combustion engine provided with an exhaust manifold 2 and with against which the opposite surfaces of a butterfly valve 9 are adapted to seat when in closed position. As illustrated in Figure 2, the1valve 9 is shaped to completely close the opening in the intake arm 4 where the sleeve 7 joins said arm. Rigidly secured or integrally formed on the straight edge 10 of the valve 9 is a disk or mounting plate 11 having a quadrant slot 12 in the peripheral margin thereof.

-The valve plate 11 projects into the inner end of the sleeve 7 and is riveted or other-. wise rigidly secured to the inner end of a lock barrel 13 to close all of the lock openings to prevent the passage of air into the arm 4 or the escape of gases therefrom. The lock barrel 13 has a plurality of adjacently disposed slotted tumblers 14L engaged therein adapted to be actuated by a key 15. The

' lock barrel 13 is rotatably mounted within a lock casing or housing 1.6 which is securely fastened in the sleeve 7 by a cut off set screw 17 (Fig. 5) or by other suitable means preventing the removal of the look. A pin 18 is secured in the inner end of the lock casing 16 and projects into the slot 12' of the valve plate 11 as illustrated in Figure 1 to afford a stop for limiting the rotation of the valve 9 to a quarter of a turn. As shown in Figures 5 and 6, the lock casing has a cylintegrally connected therewith.

drical bore and is provided with two pairs of oppositely disposed locking slots or grooves 19 and 20 for receiving the latch lugs 21 integrally formed on the opposite ends of each of the'slidable'lock tumblers 14. 1 Figures 8 to- 11 inclusive disclose a modilied form of the device wherein the reference numeral 22 indicates an engine intake manifold having a gas intake arm 23 in- Integrally formed on the intake arm 23 is a collar or sleeve 24 having a key; lock 25 mounted therein. The lock 25 is similar in construction to'the type of lock illustrated in Figures. 3 and 5 with the exception that the two grooves 20 are omitted. In this type of lock the key can only be removed when the lock tumblers are in a position ready for locking as shown in Figure Secured on the inner end of the barrel of the lock 25 is a disk or plate 26 havingan integral neck 27 on which is integrally formed a tapered or frustum shaped plug valve28 having a transverse or diametrie passage 29 therein. The plug valve 2-8 seats in a tapered valve seat member 30 which forms an integral part of the intake arm hen the valve 28 is in open position the valve passage 29 registers with the passage in the intake arm 23 and permits an unobstructed How of gases into the intake manifold 22. A screw shank 31 is integrally formed on the outer end of the plug valve 28 and has a plate 32 engaged thereon. The plate 32 is held seated against the end of the valve seat member 30 by means of a nut 33.

A coiled spring 34 (Fig. 10) is positioned within the sleeve 21 and has one end secured to the valve neck 27 and the other end ab tached to the innersurface of the sleeve 24 as illustrated in Figure 19. Also secured to the inner surface of the sleeve 24; between the plate 26 and the plug valve 28 is one end of a plate spring A tooth or latch projection 36 is integrally formed on the other end of the spring 35 and is adapted to seat ina notch provided in the valve neck 27 to hold the valve 28 in open position against the action of the coiled control spring 34. Attached to the latching endol the spring 35 is one end of a wire 3-3? which projects into the sleeve 21 through an opening 38. The wire 37 is conducted through a flexible conduit or pipe 3. and connects up with a pull plug 1.0 mounted on the instrument board or dash 11 of a motor vehicle.

As illustrated in Figure 9. the lock 25 is partly broken away to disclose an arrangement whereby the valve 28 may be held in open position against accidental closing. The lock housing is provided with a recess 12 within which a spring -13 and. :1 ball -14 are engaged. The spring 43 serves to hold the ball 4 1 projected into a detent provided in the valve plate 26 when the valve is in open position. The spring and ball arrangement is used in connection with the arrangement disclosed in Figure 10 when a key lock is provided having only the two grooves 19.

The operation is as follows:

In the form of the intake manifold lock illustrated in Figures 1 to 7 inclusive. the valve 9 is held locked in open position by the latch lugs 21 of the lock tumblers 1.4- Which project into the lock grooves 20 when the key 15 is removed from the key slot in the lock barrel 13. \Vith the valve 9 in open position gases from the carburetor G are permitted to flow past opposite sides of tne valve 9 into the engine cylinders to permit operation of the engine 1. The groove 12 in the valve plate 11 and the pin 18 serve to limit the throw of the valve 9 to an angle of ninety degrees. The valve plate 11 acts to close up the lock openings to prevent air from flowing inwardly through said lock openings into the intake arm 4 to mix with the gases entering the engine.

lVhen aperson driving an autombile wishes to stop and leaves the automobile unattended the key 15 is inserted into the barrel lock slot and through the tumbler slots thereby moving the tumblers 14 into the position shown in Figure 3, at the same timewithdrawing the tumbler latch lugs 21 out of the lock grooves 20.. By turning the key a quarter of a turn thelock barrel 13 is alsorotated a quarter of a turn into the locked position illustrated inFigures 3 and By rotating the lock barrel the valve 9 is moved from open position into the closed position shown in Figures 2 and 3 with the opposite faces of the valve seating against the intake arm ribs 8. By withdrawing the key 15 the tumblers 14 drop by gravity with the latch lugs 21 at one end of the lock tumblers engaging in one of the lock grooves 19 as shown in Figure 6 to hold the lock barrel and the valve'9 locked against movement in closed position. Gases from the carbureter 6 are thus prevented from entering the engine 1 through the intake manifold. The ribs 8 in the intake manifold serve to insure a tighter fit of the valve 9 in the intake manifold arm 4 to prevent leakage of gases past the edges of the valve. If desired the ribs may of course be omitted without affecting the operation of the valve 9. The ribs 8 also serve as stops for limiting the movement of the valve.

In the modified form of the device illustrated in Figures 8 to 11 inclusive, the intake manifold arm 23 is equipped with a passaged plug valve 28 which is attached to the barrel of the key lock 25. To open the valve a key is inserted into the key slot of the lock 25 and turned a quarter of a turn whereby the plug valve 28 is moved from the closed position shown in Figure 11 into an open position wherein the valve passage 29 is in register with the intake arm passage. As the plug valve 28 is moved into open position the control spring 34 is tensioned and the notch in the valve neck 27 is brought into the position shown in Figure 10 to permit the latch projection 36 to be seated in said notch by the spring 35. The valve 28 is thus held in open'position.

To look the intake manifold to prevent the flow of combustible gases through the intake manifold it is only necessary to pull the plug 40 which is conveniently mounted on the automobile dash 41. By pulling the plug 40 the wire 37 is tensioned and acts to draw the latch projection 36 out of the notch in the valve neck 27. The plug valve is thus released and the control spring 34 acts automatically to rotate the valve into the closed position shown in Figure 11. Movement of the valve into closed position causes the barrel of the lock 25 to rotate into a position wherein the latching lugs of the lock tumblers are permitted to engage in one of the two oppositely disposed grooves of the lock housing. The valve is thus held locked in closed position and can only be opened by inserting a key in t-hewlock 25. It will be noted that the manifold lock may be readily locked when the automobile is in motion or when it is stopped.

Figure 9 also illustrates a mechanism comprising the spring 43 and theball 44 which may be used in place of the two additional grooves 20 used in the device shown in Figures 5 and 6. The spring and ball serve to hold the valve in open-position against accidental closing, while the key controlled lock tumblers are used for holding the valve locked in closed position.

I am aware that numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

I claim as my invention:

7 1. The combination with an engine intake manifold, of a sleeve formed thereon, a lock in said sleeve, a pin on said look, a rotatable -barrel forming a part of said lock and adapted to be rotated by means of a key, a plate secured on the inner end of said barrel havinga slot therein for receiving said pin to limit the movement of said barrel, said plate serving to close the lock and barrel openings, and a valve formed on said plate and projecting into said manifold, said valve being shaped to completely restrict the flow of gases through the manifold when the valve is in closed position.

2. The combination with an engine 1ntake manifold, of a sleeve formed thereon, a lock secured in said sleeve, a barrel forming a part of said lock adapted to be rotated by means of a key, a plate secured on the inner end of said barrel to close the opening in the lock, a valve on said plate projecting into said manifold, mechanisms in said lock for holding the valve locked in closed position, means in said lock for holding the valve locked in open position, and means for limit ing the movement of said valve when the valve is actuated by using a key to rotate said lock barrel.

3. The combination with an engine intake manifold, of a sleeve formed thereon, ribs integrally formed in said manifold, a lock secured in said sleeve, a barrel forming a part of said look adapted to be rotated by means of a key, a plate secured on the inner end of said barrel having a curved slot therein, a pin on. said lock projecting into said slot for limiting the rotation of said barrel. a valve on said plate projecting into said manifold. said lock having grooves therein, tumblers in said barrel adapted to engage in said grooves to hold the valve locked in closed position contacting said manifold rigs, and means in the lock for holding the valve locked in open position.

4. A manifold shut off device comprising a lock, akey operated barrel forming a part lock to completely close one end of said lock thereof, a plate secured to said barrel to to stop the flow of air through said lock, and completely close the inner end of said lock, a valve member rigidly secured to said plate. a valve on said plate, means in 'said lock for In testimony whereof I lmve hereunto l5 5 holding the valve locked' in a closediposition subscribed my name in the presence of two When the key'is Withdrawn from said barrel subscribing witnesses. after thevalve has been moved into closed positionyancl means in saidlock forrholding MARTIN SCHROEDER' v the valve locked in openip'osition. Witnesses:

1 5'. A manifold locking device comprising FRED E. PAESLER,

a, lock,. 3, plate secured to the barrel-of the- JAMES M. OBRIEN. 

